Cylinder-grinding machine



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2 SHEETS-SHEET l.

Feb, 2U, 1923.

W. N. STEVENS.

CYLINDER GRINDING MACHINE.

FILED DEC 12, 1:321-

Feb.. M1923. v 1,445,857..

i W. Nl STEVENS.

` CYLINDER GRINDING MACHINE.

FILED DEC. 12. 1921- 2 SHEETS-SHEET 2.

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Patented lieb. Ew, lg3d. Y

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i, Miam li WELLIM N. STEVENS, 0F MADJISO'N, WJSCONSIN, ASSIGNOR T0 GKSHOLT MCHINE COMPANY, OIF MADISON', WISCONSIN, CRPORATION OIF WISCUNSXN.

entfernen-entriamo timoniere.

Application tiled December 12, 119221.l Serial No. 521,598.

To all whom t may concern:

Be it known that l, WVILLIAM N. S'rnvENs, a citizen of the United States, residing at Madison, in the county of Dane and State i of l/Visconsin, have invented certain new an useful Improvements in Cylinder- Grindinglllachines, of which the following is a specification. 4

This invention relates to machines for grinding or regrinding the bores of engine cylinders, and my present improvement relates more particularly to the spindle support; the main general object of the invention being to. reduce and prevent as much as possible the chatter and vibration in cylinder grinding machines as now built.

This object is attained according to the present invention through a modification of the adjjustable eccentric that carries v the spindle and its bearings, and is itself mounted in the rotating drum of the machine; the modification referred to consisting substantially of extending the solid eccentric some distance beyond that end of thedrum which is nearest to the grinding wheel, and locating the intermediate bearing of a two part flexible spindle within such forwardly projecting portion of the eccentric.

My invention, its novel structural features, and the advantages inhering therein will be readily understood by persons skilled in. the art from the following description, taken in connection with .the accompanying drawings wherein ll have illustrated a practical embodiment of the principle of the invention, and in whichri Fig. 1 is a longitddinal section through the spindle carriageand bearings,-showing also the upper portion of' the bed in transverse section; and y c Fig. 2 is an enlarged transverse section 4on the line2-2 of Fig. 1.

Referring to the drawing, 5 designates the bed of the machine carrying ll-shaped ways 6 on which latter is slidably mounted the spindle carriage 7. lin front and rear bearings 8 and 9 of the spindle carria e. is rotatably mounted the drum 10 driven rom a pulley 11 through a worm shaft 12, worm 13 and worm-wheel 14, as usual in this type of machine.

lEccentrically journaled in front and rear bearings l15 and 16 of the drum 10 is an eccentric 17, and eccentrically journaled in front and rear bearings 18 and 19 of the eccentric 17 is the rear section 20 of the spindle. The eccentric 17 is a solid or one piece member and it will be observed from F ig. 1 that it is formed with an integral extension 17 that projects some distance forwardly of the frpnt end of the carria e 7 and drinn 10, this projecting portion o the eccentric carrying the spindle bearing 18. On the-projecting portion 17 of the eccentric is mounted and secured, as by screws 21 and a socket 22, a forwardly projecting flanged sleeve 23, in which latter is housed the for-ward section 24 of the spindle, this latter being journaled in a rear bearing 25 carried by ythe rear portion of sleeve 23 within the projecting); portion of the eccentric and a forward bearing 26 carried by the forward end of the sleeve 23. On the forward end of the spindle section 24 is mounted the usual grinding wheel 27. rlhe two .spindle sections are. coupled by a universal joint 28, and on the rear end of' the rear section 20 ismounted the spindle drive pulley 29.

0n the eccentric 17 is a worm gear 30 engaged by a worm 31 in turn operated through intermediate gearing (not shown) from a hand vshaft 32 for adjusting the eccentricity of the spindle by partially rotating the spindle eccentric 17 in one directionor" theothcr, all as well understood in this class of machines. By forming the eccentric 17 with a solid integral extension 17 that projects for wardly of the drum, and mounting the meeting ends of the two spindle sections in said projection, and also supporting the spindle bearing sleeve on said projection, the transverse rigidity of the portion of theV spindle which projects forwardly of the drum is substantially increased, and the lateral vibration or chatter of such projecting portion of the spindle is correspondingly decreased, whereby, `as the drum rotates carrying the grinding wheel 27 bodily around the bore of the 'cylinder that is being re round, the grinding wheel itself more per ectly maintains its prescribed path of travel and lat eral vibration and chatter thereof are practically eliminated.

I claim:

1. lin a cylinder grinding machine of the class described, the combination of a cai-` riage, a drum rotatably mounted therein, an eccentricmountecl in said drum and having an integral portion projecting beyond the forward end of the latter, a spindle sleeve attached to and projecting beyond the procentric, and a flexible joint uniting the meetingends of said Spindlesections".

2. A construction as defined 1n claim l,

wherein the integral. projecting portion of i the eccentric is formed with a socket in which the rear end of the spindle sleeve is itted, and the rear journal bearing of the foi-Ward spindle section is located in 'the portion of said spindle sleeve lying Within 25 said socket.

WILLIAM N. STEVENS. 

